Reamer.



C. A. OCONNOR & E. RILEY.

BEAMER.

APPLICATION FILED MAR. 17, 1911.

Patented Nov. 12, 1912.

W' i 565" Charz'ctgm .mum MM MM nederk Jiqy,

@Womm- Jazzy.

UNITED sTATEs PATENT oEEieE.

CHARLES A. OCONNOR AND FREDERICK RILEY, OF WORCESTER, MASSACHUSETTS,ASSIGNORS TO MORSE TWIST DRILL & MACHINE COMPANY, OF NEW BEDFORD,

MASSACHUSETTS.

REAMER.

Specification of Letters Patent.

Patented Nov. i2, 1912.

To all whom it may concern.'

Be it known that we, CHARLES A. OCON- Non and FREDERICK RILEY, citizensof the United States, residingi at IVoreester, in the county ofWorcester, State o-f Massachusetts, have invented a certain new anduseful Improvement in Reamers, of which the' following is aspecification, reference being had therein to theaccompanying drawings.

This invention relates to metal working tools but more ,particularly toadjustable or expanding reamers and has for its object the providing ofa device which is more efiicient, capable of the greater adjustment, andmore easily and accurately adjusted than 'those now inuse.

Heretofore numerous forms of central cone adjustable reamers have beendevised but these have generally been constructed so that the cuttersare expanded throughout their length of a considerable portion thereofby the cone. Inthis typel the side faces of the cutters come in contactwith the perforation in which the reamer is operating and causechattering. Even when the cone exerts an' expanding pressure on aconsiderable length of the cutters, this trouble is encountered.

In the presentinvention the expanding pressure on the cutters is exertedonly at the forward extremities thereof so that only these extremitiescontact with the perforation.-

One feature of the present invention isA vportions having been removedto show the interior construction. Fig. 2, is an end view of Fig. 1.Fig. 3, section on line 3 3 of Fig. 1. Fig. 4, modified form ofexpanding bolt, as will be described hereinafter.

,Figs 5, (3 and 7, detail views.

In the drawings the body portion 10 of the realner is provided with ashank 11 constructed to enter a tool holder in the usual manner, and atthe opposite end of the body portion is a shell l2 having anaxial-opening or bore 13. This shell 1Q is split longitudinally from theouter end 13 to the pointy 15. In the embodiment shown, there are fourof these splits as is shown best in Fig. if), the slits being designated16. This shell 1s provided with a plurality of cutters 1T.

The inner end 1S of the axial opening i' is threaded to receive thethreaded extremity of the bolt 19 and this bolt is provided with aconical portion 20 adapted to act in a tapering portion 21 of the bore13. This tapering portion 21 is at. the outer end of the bore and onlyextends a very short distance therein and the conical portion '20 whichacts therein is also very short so that this cone expands the reamer atthe outer end thereof.

-This reainer is of the end operating type, in that only the outercorners Q0 of tlie cutters perform the cutting. For this reason. it isdesirable to expand only the extreniitv thereof. If the cone extends anyconsiderable distance into the bore, a considerable I length of thecutters must necessarily he expanded thereby and such constructionprevents the proper operation of the cutters. Also the longer cone, whenthe saine is integral with the bolt, makes it much more diiiicult toturn the bolt on account of the greater friction surfaces involved.

Near the outer end of the holt 19 is an enlarged threaded portion 23over which is adapted to slip a cup shaped washer Q-t. best shown inFigs. 1 and 5, which engages the end 14 of the. rcamer having a convexface. Upon this threaded portion Qi operates the lock-nut Q5 adapted tobind the. washer Q4 against the end portion 14. The extremity 2G of thebolt 19 adapted to he grasped by a. wrench to permit this bolt to beadvanced or withdrawn as is usual in this type of reamer.

In Fig. 4 of the drawing is illustrated a very desirable modification ofthe. invention in which a loose cone 27 is provided in place of theusual conical portion integral with the bolt. This feature is a veryimportant one as it allows the holt to revolve within thc conicalportion and thus this conical portion does not. have to rotate withinthe tapering portion of the hore. permitting the reanicr to be adjustedniuch more easily than with the fixed cone. )riso thisy constructionperY .titi

mits cones of diierent sizes or styles to be placed upon the bolt whengreater or less degress of expansion are required. This cone actsagainst the shoulder 28 on the threaded portion 29 of the bolt.

Figs. 6 and 7 show detailed views of the cone removed from the bolt,Fig. 6 being a side elevation and Fig. 7, a View of the end contactingwith the shoulder 28.

The applicants are aware that numerous other modifications could be madeby anyone skilled in the art Without departing from the scope of theappended claims and therefore they do not care to be limited to theparticular embodiments., herein shown and described.

What we claim as our invention and desire to secure by Letters Patent issaid axial opening to exert a pressure on the walls thereof to causesaid shell to expand, and a shoulder on said bolt against which saidconical member acts.

2. In a device of the class described, the combination of a body ortionrovided at one end with an expansilile shell avin cutting members on theouter face thereo and an axial opening therein; a bolt within saidopening having its inner end threaded to act in a corresponding threadedportion within said axial opening; a sleeve mounted upon said bolthaving its inner face smooth to contact withv a corresponding smoothportion of said bolt and its outer face conical to exert an expandingpressure on a corre sponding tapering portion of the walls of saidopening; a shoulder on said bolt against which said sleeve acts; andmeans for locking said shell upon said sleeve'.

In Witness whereof we have hereunto set our hands this 9th day of March1911.

CHARLES A. OCONNOR. FREDERICK RILEY.

Witnesses:

HARTLEY W. BARTLE'x'r, EMMA E. GALE.

